Description
Tube Type / Number: CV4003 [British Military Designation for 12AU7]
Actual Brand*: RFT / Tungsram
Printed Brand: Chelmer Valve
Quantity: 1 Pieces - Single
Matching Date Codes?
Plate Construction: Gray
Getter Construction: Small Top O, Foil Getter Post (this is how we know it's an RFT tube)
Country of Manufacture: Germany
Visible Date Codes: 6087
Lettering Condition: 100 Percent
Number of Mica Spacers: 2
Mica Spacer Shape:
Glass Coating: None
Engraved Base? No
Boxes (always included): 1 Box - Original
Notes:
Testing: We have multiples of these in stock and therefore are not listing the test results here. All of these have been tested and or matched by/for Gain and Gm at real world voltage on a Maxi-Matcher tube tester. Test results are on box.
** Please note, many tubes will test NOS but will actually have a few hours of use on them. A truly NOS tube will have excellent getter flashing condition, no dirt/grime, usually in the original box, and no filament deposits. If a tube is listed as "tests NOS" but is listed as "not True NOS" please expect the tube to have a small amount of use *
All tubes have been tested using only the best tube testers. We have a large fleet of tube testers, and every single one of them has been calibrated within the last year by industry experts. We mainly use the Hickok TV-7D/U, but occasionally we may use a Hickok 539, 533A, or 600A.